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On guaranteeing hard real-time tasks
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There are two fundamental aspects in the design of the real-time systems: to meet the real-time constraints and to be reliable. These two aspects are in conflict and usually are researched separately. To provide for fault-tolerance on one side, there is the need for a greater execution time; but on the other side real-time systems require tasks to be completed by their deadlines.There is a clear and urgent need for mechanisms that are able to integrate the real-time and the reliability requirements. So, it would be possible to address the real-time and fault-tolerance requirements together during the design of the system. This would make the development of reliable real-time systems simple and efficient. Our approach is based on the idea that if the system is adaptable then the reliability is easier to achieve. We have developed a mechanism, known as Real-Time Recoverable Action (RTR-Action), which integrates the real-time and the reliability requirements.